Photometry of Lamps, LEDs & Luminaires

Luminaire

Photometric Testing provides a comprehensive laboratory service for testing the amount, colour, quality and spatial distribution of light emitted from lamps, LEDs and luminaires. We provide standard photometric data files in IES (.ies) and EULUMDAT (.ldt) formats per IES LM 79-08 and BS EN 13032. We can also report luminous flux (lumens), unified glare ratio (UGR), scotopic lumens and S:P ratio, chromaticity, CCT, colour rendering, luminous efficacy (wall plug efficiency) and power factor.

What Can We Measure?

Relevant Standards

Photometric / Spectroradiometric

Spectral radiant flux, 350-1000nm (Watts/nm)
Spectral irradiance, 200-1700nm (W/m².nm)
Spectral Radiance, 200-1700nm (W/sr.m².nm)
Total luminous flux (lumens)
Scotopic flux (lumens)
S:P ratio
Useful lumens
Illuminance (lux)
Luminous intensity (candelas)

Colorimetric

CIE chromaticity (xy, uv, u'v')
Correlated colour temperature, CCT (Kelvin)
Dominant wavelength (nm) & purity
Colour rendering index, CRI (R_A, R_1-14)
Colour quality scale, CQS
MacAdams Ellipses & SDCM

Spatial / Angular

Luminous intensity vs. angle
Luminance vs. angle
CCT vs. angle
CRI vs. angle
Beam angle
Polar intensity charts
Cone illuminance diagrams
Unified glare rating (UGR) reports
Photometric data files in .ies and .ldt (EULUMDAT) formats

Electrical

Power consumption (Watts)
Light output ratio (LOR)
Luminous efficacy (lumens / Watt)
Energy efficiency index (EEI)
Power factor

IES LM-79-08 Approved Method for Electrical & Photometric Measurements of Solid State Lighting Products
BS EN 13032-1:2004 Measurement & Presentation of Photometric Data for Lamps & Luminaires
BS EN 5489:2012 & ILP PLG-03 (2012) - Measurement of Street Lighting and S:P Ratio

Photometric Testing has invested significant sums in equipping our laboratory with the very latest, state-of-the-art equipment. Our laboratory services rely upon two main pieces of measurement equipment, our integrating spheres and our goniophotometers. Our integrating spheres are configured as spectroradiometers to accurately measure luminous flux (lumens) as well as the colour temperature and colour rendering of the light source under test. Our goniophotometers provide both near-field (luminance) and far-field (luminous intensity) data and are used for generating standard photometric data in the popular .ies and .ldt (EULUMDAT) formats for use with lighting design softfware such as RELUX, DIALUX and Lighting Reality. We are one of the few laboratories capable of measuring colour temperature and colour rendering as a function of angle.

Please use our enquiry form to have a technical specialist call you back or to request a quotation for a measurement.